Page 295 - My FlipBook

CAVITY PREPARATIONS 263

*5. Adjust the matrix to several teeth on the technic form.
C. Cavity Preparation.

*i. Drawings.—OutKne drawings of the outKne form of
typical cavities in the occlusal surfaces of upper bicuspids,
lower bicuspids, upper molars, lower molars, and the proximal
surfaces of the anterior teeth.
*2. Preparing Mortise Forms.—Carve to form six cubes

of plaster of Paris, 2 inches square, and on these prepare:
(a) The simple mortise form, one surface.
(b) The simple mortise form, two surfaces.
(c) The simple dovetail mortise form, one surface.

(d) The simple dovetail mortise form, two surfaces.
(e) The compound mortise form (step form).
(f) The compound dovetail mortise form.
Study the names of the cavity walls and line and point
angles in these imaginary cavities.
Deepen the convenience angles and bevel the
(g)
margins.
*3. Preparing Cavities in the Bone Handle.—Prepare six
cavities in the bone handle, to be later filled with non-cohesive

tin.
4. Preparing Cavities on Enlarged Plaster Teeth.—Pre-
pare six cavities on the enlarged plaster teeth, carved in the
Dental Anatomy Technic Course.
5. Preparing Cavities in Ivory Teeth.—Prepare six cavities
in the ivory teeth carved in the same course.

6. Preparing Cavities in Extracted Teeth.—Prepare six
cavities in extracted teeth. In case sufficient work in sawing
and filing sections has not been done to impress upon the
student's mind the relative thickness of enamel and dentin

and the relation of the pulp chamber to the tooth surface,
the work in cavity preparation on extracted teeth may be